The bus had gone across the footpath and partly through a railing.LIVE UPDATES: Multiple emergency service vehicles, including Fire and Emergency and St John Ambulance, were at the scene.
"Motorists should expect delays and are advised to avoid the area if possible," a police statement said. Holly Gillan was on her way back from the gym when she heard a loud noise behind her that sounded like an explosion."It looks like the driver lost control and hit the railing."The bus was anchored to a fire truck with a steel cable and Fire and Emergency NZ was bringing in heavy haulage.Twisted and bent metal railings could be seen where the bus had gone through the bridge's barriers.